CustomCat Product Export Failing After Multiple Successes in the same day—What’s Causing the Limit?

The reason the exports are failing is due to a variant restriction. The variant limitation is imposed by Shopify, not CustomCat. Shopify restricts the number of variants being created via the API once a certain threshold has been reached on a shop.

The current throttle is set to 1,000 variants per 24 hour period, once a shop has 50,000 variants (subject to change). Once you hit this limit, the API will return an error for all variant creating requests until the throttle resets.

You can try contacting Shopify and upgrading your plan, which increases your variant limit.